/*
* QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
*
* PAPR Virtual SCSI, aka ibmvscsi
*
* Copyright (c) 2010,2011 Benjamin Herrenschmidt, IBM Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* TODO:
*
* - Cleanups :-)
* - Sort out better how to assign devices to VSCSI instances
* - Fix residual counts
* - Add indirect descriptors support
* - Maybe do autosense (PAPR seems to mandate it, linux doesn't care)
*/
#include "hw.h"
#include "scsi.h"
#include "scsi-defs.h"
#include "net.h" /* Remove that when we can */
#include "srp.h"
#include "hw/qdev.h"
#include "hw/spapr.h"
#include "hw/spapr_vio.h"
#include "hw/ppc-viosrp.h"
#include <libfdt.h>
/*#define DEBUG_VSCSI*/
#ifdef DEBUG_VSCSI
#define dprintf(fmt, ...) \
do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
#else
#define dprintf(fmt, ...) \
do { } while (0)
#endif
/*
* Virtual SCSI device
*/
/* Random numbers */
#define VSCSI_MAX_SECTORS 4096
#define VSCSI_REQ_LIMIT 24
#define SCSI_SENSE_BUF_SIZE 96
#define SRP_RSP_SENSE_DATA_LEN 18
typedef union vscsi_crq {
struct viosrp_crq s;
uint8_t raw[16];
} vscsi_crq;
typedef struct vscsi_req {
vscsi_crq crq;
union viosrp_iu iu;
/* SCSI request tracking */
SCSIRequest *sreq;
uint32_t qtag; /* qemu tag != srp tag */
int lun;
int active;
long data_len;
int writing;
int sensing;
int senselen;
uint8_t sense[SCSI_SENSE_BUF_SIZE];
/* RDMA related bits */
uint8_t dma_fmt;
struct srp_direct_buf ext_desc;
struct srp_direct_buf *cur_desc;
struct srp_indirect_buf *ind_desc;
int local_desc;
int total_desc;
} vscsi_req;
typedef struct {
VIOsPAPRDevice vdev;
SCSIBus bus;
vscsi_req reqs[VSCSI_REQ_LIMIT];
} VSCSIState;
/* XXX Debug only */
static VSCSIState *dbg_vscsi_state;
static struct vscsi_req *vscsi_get_req(VSCSIState *s)
{
vscsi_req *req;
int i;
for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
req = &s->reqs[i];
if (!req->active) {
memset(req, 0, sizeof(*req));
req->qtag = i;
req->active = 1;
return req;
}
}
return NULL;
}
static void vscsi_put_req(VSCSIState *s, vscsi_req *req)
{
if (req->sreq != NULL) {
scsi_req_unref(req->sreq);
}
req->sreq = NULL;
req->active = 0;
}
static vscsi_req *vscsi_find_req(VSCSIState *s, SCSIRequest *req)
{
uint32_t tag = req->tag;
if (tag >= VSCSI_REQ_LIMIT || !s->reqs[tag].active) {
return NULL;
}
return &s->reqs[tag];
}
static void vscsi_decode_id_lun(uint64_t srp_lun, int *id, int *lun)
{
/* XXX Figure that one out properly ! This is crackpot */
*id = (srp_lun >> 56) & 0x7f;
*lun = (srp_lun >> 48) & 0xff;
}
static int vscsi_send_iu(VSCSIState *s, vscsi_req *req,
uint64_t length, uint8_t format)
{
long rc, rc1;
/* First copy the SRP */
rc = spapr_tce_dma_write(&s->vdev, req->crq.s.IU_data_ptr,
&req->iu, length);
if (rc) {
fprintf(stderr, "vscsi_send_iu: DMA write failure !\n");
}
req->crq.s.valid = 0x80;
req->crq.s.format = format;
req->crq.s.reserved = 0x00;
req->crq.s.timeout = cpu_to_be16(0x0000);
req->crq.s.IU_length = cpu_to_be16(length);
req->crq.s.IU_data_ptr = req->iu.srp.rsp.tag; /* right byte order */
if (rc == 0) {
req->crq.s.status = 0x99; /* Just needs to be non-zero */
} else {
req->crq.s.status = 0x00;
}
rc1 = spapr_vio_send_crq(&s->vdev, req->crq.raw);
if (rc1) {
fprintf(stderr, "vscsi_send_iu: Error sending response\n");
return rc1;
}
return rc;
}
static void vscsi_makeup_sense(VSCSIState *s, vscsi_req *req,
uint8_t key, uint8_t asc, uint8_t ascq)
{
req->senselen = SRP_RSP_SENSE_DATA_LEN;
/* Valid bit and 'current errors' */
req->sense[0] = (0x1 << 7 | 0x70);
/* Sense key */
req->sense[2] = key;
/* Additional sense length */
req->sense[7] = 0xa; /* 10 bytes */
/* Additional sense code */
req->sense[12] = asc;
req->sense[13] = ascq;
}
static int vscsi_send_rsp(VSCSIState *s, vscsi_req *req,
uint8_t status, int32_t res_in, int32_t res_out)
{
union viosrp_iu *iu = &req->iu;
uint64_t tag = iu->srp.rsp.tag;
int total_len = sizeof(iu->srp.rsp);
dprintf("VSCSI: Sending resp status: 0x%x, "
"res_in: %d, res_out: %d\n", status, res_in, res_out);
memset(iu, 0, sizeof(struct srp_rsp));
iu->srp.rsp.opcode = SRP_RSP;
iu->srp.rsp.req_lim_delta = cpu_to_be32(1);
iu->srp.rsp.tag = tag;
/* Handle residuals */
if (res_in < 0) {
iu->srp.rsp.flags |= SRP_RSP_FLAG_DIUNDER;
res_in = -res_in;
} else if (res_in) {
iu->srp.rsp.flags |= SRP_RSP_FLAG_DIOVER;
}
if (res_out < 0) {
iu->srp.rsp.flags |= SRP_RSP_FLAG_DOUNDER;
res_out = -res_out;
} else if (res_out) {
iu->srp.rsp.flags |= SRP_RSP_FLAG_DOOVER;
}
iu->srp.rsp.data_in_res_cnt = cpu_to_be32(res_in);
iu->srp.rsp.data_out_res_cnt = cpu_to_be32(res_out);
/* We don't do response data */
/* iu->srp.rsp.flags &= ~SRP_RSP_FLAG_RSPVALID; */
iu->srp.rsp.resp_data_len = cpu_to_be32(0);
/* Handle success vs. failure */
iu->srp.rsp.status = status;
if (status) {
iu->srp.rsp.sol_not = (iu->srp.cmd.sol_not & 0x04) >> 2;
if (req->senselen) {
req->iu.srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID;
req->iu.srp.rsp.sense_data_len = cpu_to_be32(req->senselen);
memcpy(req->iu.srp.rsp.data, req->sense, req->senselen);
total_len += req->senselen;
}
} else {
iu->srp.rsp.sol_not = (iu->srp.cmd.sol_not & 0x02) >> 1;
}
vscsi_send_iu(s, req, total_len, VIOSRP_SRP_FORMAT);
return 0;
}
static inline void vscsi_swap_desc(struct srp_direct_buf *desc)
{
desc->va = be64_to_cpu(desc->va);
desc->len = be32_to_cpu(desc->len);
}
static int vscsi_srp_direct_data(VSCSIState *s, vscsi_req *req,
uint8_t *buf, uint32_t len)
{
struct srp_direct_buf *md = req->cur_desc;
uint32_t llen;
int rc = 0;
dprintf("VSCSI: direct segment 0x%x bytes, va=0x%llx desc len=0x%x\n",
len, (unsigned long long)md->va, md->len);
llen = MIN(len, md->len);
if (llen) {
if (req->writing) { /* writing = to device = reading from memory */
rc = spapr_tce_dma_read(&s->vdev, md->va, buf, llen);
} else {
rc = spapr_tce_dma_write(&s->vdev, md->va, buf, llen);
}
}
md->len -= llen;
md->va += llen;
if (rc) {
return -1;
}
return llen;
}
static int vscsi_srp_indirect_data(VSCSIState *s, vscsi_req *req,
uint8_t *buf, uint32_t len)
{
struct srp_direct_buf *td = &req->ind_desc->table_desc;
struct srp_direct_buf *md = req->cur_desc;
int rc = 0;
uint32_t llen, total = 0;
dprintf("VSCSI: indirect segment 0x%x bytes, td va=0x%llx len=0x%x\n",
len, (unsigned long long)td->va, td->len);
/* While we have data ... */
while (len) {
/* If we have a descriptor but it's empty, go fetch a new one */
if (md && md->len == 0) {
/* More local available, use one */
if (req->local_desc) {
md = ++req->cur_desc;
--req->local_desc;
--req->total_desc;
td->va += sizeof(struct srp_direct_buf);
} else {
md = req->cur_desc = NULL;
}
}
/* No descriptor at hand, fetch one */
if (!md) {
if (!req->total_desc) {
dprintf("VSCSI: Out of descriptors !\n");
break;
}
md = req->cur_desc = &req->ext_desc;
dprintf("VSCSI: Reading desc from 0x%llx\n",
(unsigned long long)td->va);
rc = spapr_tce_dma_read(&s->vdev, td->va, md,
sizeof(struct srp_direct_buf));
if (rc) {
dprintf("VSCSI: tce_dma_read -> %d reading ext_desc\n", rc);
break;
}
vscsi_swap_desc(md);
td->va += sizeof(struct srp_direct_buf);
--req->total_desc;
}
dprintf("VSCSI: [desc va=0x%llx,len=0x%x] remaining=0x%x\n",
(unsigned long long)md->va, md->len, len);
/* Perform transfer */
llen = MIN(len, md->len);
if (req->writing) { /* writing = to device = reading from memory */
rc = spapr_tce_dma_read(&s->vdev, md->va, buf, llen);
} else {
rc = spapr_tce_dma_write(&s->vdev, md->va, buf, llen);
}
if (rc) {
dprintf("VSCSI: tce_dma_r/w(%d) -> %d\n", req->writing, rc);
break;
}
dprintf("VSCSI: data: %02x %02x %02x %02x...\n",
buf[0], buf[1], buf[2], buf[3]);
len -= llen;
buf += llen;
total += llen;
md->va += llen;
md->len -= llen;
}
return rc ? -1 : total;
}
static int vscsi_srp_transfer_data(VSCSIState *s, vscsi_req *req,
int writing, uint8_t *buf, uint32_t len)
{
int err = 0;
switch (req->dma_fmt) {
case SRP_NO_DATA_DESC:
dprintf("VSCSI: no data desc transfer, skipping 0x%x bytes\n", len);
break;
case SRP_DATA_DESC_DIRECT:
err = vscsi_srp_direct_data(s, req, buf, len);
break;
case SRP_DATA_DESC_INDIRECT:
err = vscsi_srp_indirect_data(s, req, buf, len);
break;
}
return err;
}
/* Bits from linux srp */
static int data_out_desc_size(struct srp_cmd *cmd)
{
int size = 0;
uint8_t fmt = cmd->buf_fmt >> 4;
switch (fmt) {
case SRP_NO_DATA_DESC:
break;
case SRP_DATA_DESC_DIRECT:
size = sizeof(struct srp_direct_buf);
break;
case SRP_DATA_DESC_INDIRECT:
size = sizeof(struct srp_indirect_buf) +
sizeof(struct srp_direct_buf)*cmd->data_out_desc_cnt;
break;
default:
break;
}
return size;
}
static int vscsi_preprocess_desc(vscsi_req *req)
{
struct srp_cmd *cmd = &req->iu.srp.cmd;
int offset, i;
offset = cmd->add_cdb_len & ~3;
if (req->writing) {
req->dma_fmt = cmd->buf_fmt >> 4;
} else {
offset += data_out_desc_size(cmd);
req->dma_fmt = cmd->buf_fmt & ((1U << 4) - 1);
}
switch (req->dma_fmt) {
case SRP_NO_DATA_DESC:
break;
case SRP_DATA_DESC_DIRECT:
req->cur_desc = (struct srp_direct_buf *)(cmd->add_data + offset);
req->total_desc = req->local_desc = 1;
vscsi_swap_desc(req->cur_desc);
dprintf("VSCSI: using direct RDMA %s, 0x%x bytes MD: 0x%llx\n",
req->writing ? "write" : "read",
req->cur_desc->len, (unsigned long long)req->cur_desc->va);
break;
case SRP_DATA_DESC_INDIRECT:
req->ind_desc = (struct srp_indirect_buf *)(cmd->add_data + offset);
vscsi_swap_desc(&req->ind_desc->table_desc);
req->total_desc = req->ind_desc->table_desc.len /
sizeof(struct srp_direct_buf);
req->local_desc = req->writing ? cmd->data_out_desc_cnt :
cmd->data_in_desc_cnt;
for (i = 0; i < req->local_desc; i++) {
vscsi_swap_desc(&req->ind_desc->desc_list[i]);
}
req->cur_desc = req->local_desc ? &req->ind_desc->desc_list[0] : NULL;
dprintf("VSCSI: using indirect RDMA %s, 0x%x bytes %d descs "
"(%d local) VA: 0x%llx\n",
req->writing ? "read" : "write",
be32_to_cpu(req->ind_desc->len),
req->total_desc, req->local_desc,
(unsigned long long)req->ind_desc->table_desc.va);
break;
default:
fprintf(stderr,
"vscsi_preprocess_desc: Unknown format %x\n", req->dma_fmt);
return -1;
}
return 0;
}
static void vscsi_send_request_sense(VSCSIState *s, vscsi_req *req)
{
uint8_t *cdb = req->iu.srp.cmd.cdb;
int n;
n = scsi_req_get_sense(req->sreq, req->sense, sizeof(req->sense));
if (n) {
req->senselen = n;
vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
vscsi_put_req(s, req);
return;
}
dprintf("VSCSI: Got CHECK_CONDITION, requesting sense...\n");
cdb[0] = 3;
cdb[1] = 0;
cdb[2] = 0;
cdb[3] = 0;
cdb[4] = 96;
cdb[5] = 0;
req->sensing = 1;
n = scsi_req_enqueue(req->sreq, cdb);
dprintf("VSCSI: Queued request sense tag 0x%x\n", req->qtag);
if (n < 0) {
fprintf(stderr, "VSCSI: REQUEST_SENSE wants write data !?!?!?\n");
vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
scsi_req_abort(req->sreq, CHECK_CONDITION);
return;
} else if (n == 0) {
return;
}
scsi_req_continue(req->sreq);
}
/* Callback to indicate that the SCSI layer has completed a transfer. */
static void vscsi_command_complete(SCSIRequest *sreq, int reason, uint32_t arg)
{
VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent);
vscsi_req *req = vscsi_find_req(s, sreq);
uint8_t *buf;
int32_t res_in = 0, res_out = 0;
int len, rc = 0;
dprintf("VSCSI: SCSI cmd complete, r=0x%x tag=0x%x arg=0x%x, req=%p\n",
reason, sreq->tag, arg, req);
if (req == NULL) {
fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag);
return;
}
if (req->sensing) {
if (reason == SCSI_REASON_DONE) {
dprintf("VSCSI: Sense done !\n");
vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
vscsi_put_req(s, req);
} else {
uint8_t *buf = scsi_req_get_buf(sreq);
len = MIN(arg, SCSI_SENSE_BUF_SIZE);
dprintf("VSCSI: Sense data, %d bytes:\n", len);
dprintf(" %02x %02x %02x %02x %02x %02x %02x %02x\n",
buf[0], buf[1], buf[2], buf[3],
buf[4], buf[5], buf[6], buf[7]);
dprintf(" %02x %02x %02x %02x %02x %02x %02x %02x\n",
buf[8], buf[9], buf[10], buf[11],
buf[12], buf[13], buf[14], buf[15]);
memcpy(req->sense, buf, len);
req->senselen = len;
scsi_req_continue(req->sreq);
}
return;
}
if (reason == SCSI_REASON_DONE) {
dprintf("VSCSI: Command complete err=%d\n", arg);
if (arg == 0) {
/* We handle overflows, not underflows for normal commands,
* but hopefully nobody cares
*/
if (req->writing) {
res_out = req->data_len;
} else {
res_in = req->data_len;
}
vscsi_send_rsp(s, req, 0, res_in, res_out);
} else if (arg == CHECK_CONDITION) {
vscsi_send_request_sense(s, req);
return;
} else {
vscsi_send_rsp(s, req, arg, 0, 0);
}
vscsi_put_req(s, req);
return;
}
/* "arg" is how much we have read for reads and how much we want
* to write for writes (ie, how much is to be DMA'd)
*/
if (arg) {
buf = scsi_req_get_buf(sreq);
rc = vscsi_srp_transfer_data(s, req, req->writing, buf, arg);
}
if (rc < 0) {
fprintf(stderr, "VSCSI: RDMA error rc=%d!\n", rc);
vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
scsi_req_abort(req->sreq, CHECK_CONDITION);
return;
}
/* Start next chunk */
req->data_len -= rc;
scsi_req_continue(sreq);
}
static void vscsi_request_cancelled(SCSIRequest *sreq)
{
VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent);
vscsi_req *req = vscsi_find_req(s, sreq);
vscsi_put_req(s, req);
}
static void vscsi_process_login(VSCSIState *s, vscsi_req *req)
{
union viosrp_iu *iu = &req->iu;
struct srp_login_rsp *rsp = &iu->srp.login_rsp;
uint64_t tag = iu->srp.rsp.tag;
dprintf("VSCSI: Got login, sendin response !\n");
/* TODO handle case that requested size is wrong and
* buffer format is wrong
*/
memset(iu, 0, sizeof(struct srp_login_rsp));
rsp->opcode = SRP_LOGIN_RSP;
/* Don't advertise quite as many request as we support to
* keep room for management stuff etc...
*/
rsp->req_lim_delta = cpu_to_be32(VSCSI_REQ_LIMIT-2);
rsp->tag = tag;
rsp->max_it_iu_len = cpu_to_be32(sizeof(union srp_iu));
rsp->max_ti_iu_len = cpu_to_be32(sizeof(union srp_iu));
/* direct and indirect */
rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT);
vscsi_send_iu(s, req, sizeof(*rsp), VIOSRP_SRP_FORMAT);
}
static void vscsi_inquiry_no_target(VSCSIState *s, vscsi_req *req)
{
uint8_t *cdb = req->iu.srp.cmd.cdb;
uint8_t resp_data[36];
int rc, len, alen;
/* We dont do EVPD. Also check that page_code is 0 */
if ((cdb[1] & 0x01) || (cdb[1] & 0x01) || cdb[2] != 0) {
/* Send INVALID FIELD IN CDB */
vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0);
vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
return;
}
alen = cdb[3];
alen = (alen << 8) | cdb[4];
len = MIN(alen, 36);
/* Fake up inquiry using PQ=3 */
memset(resp_data, 0, 36);
resp_data[0] = 0x7f; /* Not capable of supporting a device here */
resp_data[2] = 0x06; /* SPS-4 */
resp_data[3] = 0x02; /* Resp data format */
resp_data[4] = 36 - 5; /* Additional length */
resp_data[7] = 0x10; /* Sync transfers */
memcpy(&resp_data[16], "QEMU EMPTY ", 16);
memcpy(&resp_data[8], "QEMU ", 8);
req->writing = 0;
vscsi_preprocess_desc(req);
rc = vscsi_srp_transfer_data(s, req, 0, resp_data, len);
if (rc < 0) {
vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
} else {
vscsi_send_rsp(s, req, 0, 36 - rc, 0);
}
}
static int vscsi_queue_cmd(VSCSIState *s, vscsi_req *req)
{
union srp_iu *srp = &req->iu.srp;
SCSIDevice *sdev;
int n, id, lun;
vscsi_decode_id_lun(be64_to_cpu(srp->cmd.lun), &id, &lun);
/* Qemu vs. linux issue with LUNs to be sorted out ... */
sdev = (id < 8 && lun < 16) ? s->bus.devs[id] : NULL;
if (!sdev) {
dprintf("VSCSI: Command for id %d with no drive\n", id);
if (srp->cmd.cdb[0] == INQUIRY) {
vscsi_inquiry_no_target(s, req);
} else {
vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0x00);
vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
} return 1;
}
req->lun = lun;
req->sreq = scsi_req_new(sdev, req->qtag, lun);
n = scsi_req_enqueue(req->sreq, srp->cmd.cdb);
dprintf("VSCSI: Queued command tag 0x%x CMD 0x%x ID %d LUN %d ret: %d\n",
req->qtag, srp->cmd.cdb[0], id, lun, n);
if (n) {
/* Transfer direction must be set before preprocessing the
* descriptors
*/
req->writing = (n < 1);
/* Preprocess RDMA descriptors */
vscsi_preprocess_desc(req);
/* Get transfer direction and initiate transfer */
if (n > 0) {
req->data_len = n;
} else if (n < 0) {
req->data_len = -n;
}
scsi_req_continue(req->sreq);
}
/* Don't touch req here, it may have been recycled already */
return 0;
}
static int vscsi_process_tsk_mgmt(VSCSIState *s, vscsi_req *req)
{
union viosrp_iu *iu = &req->iu;
int fn;
fprintf(stderr, "vscsi_process_tsk_mgmt %02x\n",
iu->srp.tsk_mgmt.tsk_mgmt_func);
switch (iu->srp.tsk_mgmt.tsk_mgmt_func) {
#if 0 /* We really don't deal with these for now */
case SRP_TSK_ABORT_TASK:
fn = ABORT_TASK;
break;
case SRP_TSK_ABORT_TASK_SET:
fn = ABORT_TASK_SET;
break;
case SRP_TSK_CLEAR_TASK_SET:
fn = CLEAR_TASK_SET;
break;
case SRP_TSK_LUN_RESET:
fn = LOGICAL_UNIT_RESET;
break;
case SRP_TSK_CLEAR_ACA:
fn = CLEAR_ACA;
break;
#endif
default:
fn = 0;
}
if (fn) {
/* XXX Send/Handle target task management */
;
} else {
vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x20, 0);
vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
}
return !fn;
}
static int vscsi_handle_srp_req(VSCSIState *s, vscsi_req *req)
{
union srp_iu *srp = &req->iu.srp;
int done = 1;
uint8_t opcode = srp->rsp.opcode;
switch (opcode) {
case SRP_LOGIN_REQ:
vscsi_process_login(s, req);
break;
case SRP_TSK_MGMT:
done = vscsi_process_tsk_mgmt(s, req);
break;
case SRP_CMD:
done = vscsi_queue_cmd(s, req);
break;
case SRP_LOGIN_RSP:
case SRP_I_LOGOUT:
case SRP_T_LOGOUT:
case SRP_RSP:
case SRP_CRED_REQ:
case SRP_CRED_RSP:
case SRP_AER_REQ:
case SRP_AER_RSP:
fprintf(stderr, "VSCSI: Unsupported opcode %02x\n", opcode);
break;
default:
fprintf(stderr, "VSCSI: Unknown type %02x\n", opcode);
}
return done;
}
static int vscsi_send_adapter_info(VSCSIState *s, vscsi_req *req)
{
struct viosrp_adapter_info *sinfo;
struct mad_adapter_info_data info;
int rc;
sinfo = &req->iu.mad.adapter_info;
#if 0 /* What for ? */
rc = spapr_tce_dma_read(&s->vdev, be64_to_cpu(sinfo->buffer),
&info, be16_to_cpu(sinfo->common.length));
if (rc) {
fprintf(stderr, "vscsi_send_adapter_info: DMA read failure !\n");
}
#endif
memset(&info, 0, sizeof(info));
strcpy(info.srp_version, SRP_VERSION);
strncpy(info.partition_name, "qemu", sizeof("qemu"));
info.partition_number = cpu_to_be32(0);
info.mad_version = cpu_to_be32(1);
info.os_type = cpu_to_be32(2);
info.port_max_txu[0] = cpu_to_be32(VSCSI_MAX_SECTORS << 9);
rc = spapr_tce_dma_write(&s->vdev, be64_to_cpu(sinfo->buffer),
&info, be16_to_cpu(sinfo->common.length));
if (rc) {
fprintf(stderr, "vscsi_send_adapter_info: DMA write failure !\n");
}
sinfo->common.status = rc ? cpu_to_be32(1) : 0;
return vscsi_send_iu(s, req, sizeof(*sinfo), VIOSRP_MAD_FORMAT);
}
static int vscsi_handle_mad_req(VSCSIState *s, vscsi_req *req)
{
union mad_iu *mad = &req->iu.mad;
switch (be32_to_cpu(mad->empty_iu.common.type)) {
case VIOSRP_EMPTY_IU_TYPE:
fprintf(stderr, "Unsupported EMPTY MAD IU\n");
break;
case VIOSRP_ERROR_LOG_TYPE:
fprintf(stderr, "Unsupported ERROR LOG MAD IU\n");
mad->error_log.common.status = cpu_to_be16(1);
vscsi_send_iu(s, req, sizeof(mad->error_log), VIOSRP_MAD_FORMAT);
break;
case VIOSRP_ADAPTER_INFO_TYPE:
vscsi_send_adapter_info(s, req);
break;
case VIOSRP_HOST_CONFIG_TYPE:
mad->host_config.common.status = cpu_to_be16(1);
vscsi_send_iu(s, req, sizeof(mad->host_config), VIOSRP_MAD_FORMAT);
break;
default:
fprintf(stderr, "VSCSI: Unknown MAD type %02x\n",
be32_to_cpu(mad->empty_iu.common.type));
}
return 1;
}
static void vscsi_got_payload(VSCSIState *s, vscsi_crq *crq)
{
vscsi_req *req;
int done;
req = vscsi_get_req(s);
if (req == NULL) {
fprintf(stderr, "VSCSI: Failed to get a request !\n");
return;
}
/* We only support a limited number of descriptors, we know
* the ibmvscsi driver uses up to 10 max, so it should fit
* in our 256 bytes IUs. If not we'll have to increase the size
* of the structure.
*/
if (crq->s.IU_length > sizeof(union viosrp_iu)) {
fprintf(stderr, "VSCSI: SRP IU too long (%d bytes) !\n",
crq->s.IU_length);
return;
}
/* XXX Handle failure differently ? */
if (spapr_tce_dma_read(&s->vdev, crq->s.IU_data_ptr, &req->iu,
crq->s.IU_length)) {
fprintf(stderr, "vscsi_got_payload: DMA read failure !\n");
qemu_free(req);
}
memcpy(&req->crq, crq, sizeof(vscsi_crq));
if (crq->s.format == VIOSRP_MAD_FORMAT) {
done = vscsi_handle_mad_req(s, req);
} else {
done = vscsi_handle_srp_req(s, req);
}
if (done) {
vscsi_put_req(s, req);
}
}
static int vscsi_do_crq(struct VIOsPAPRDevice *dev, uint8_t *crq_data)
{
VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev);
vscsi_crq crq;
memcpy(crq.raw, crq_data, 16);
crq.s.timeout = be16_to_cpu(crq.s.timeout);
crq.s.IU_length = be16_to_cpu(crq.s.IU_length);
crq.s.IU_data_ptr = be64_to_cpu(crq.s.IU_data_ptr);
dprintf("VSCSI: do_crq %02x %02x ...\n", crq.raw[0], crq.raw[1]);
switch (crq.s.valid) {
case 0xc0: /* Init command/response */
/* Respond to initialization request */
if (crq.s.format == 0x01) {
memset(crq.raw, 0, 16);
crq.s.valid = 0xc0;
crq.s.format = 0x02;
spapr_vio_send_crq(dev, crq.raw);
}
/* Note that in hotplug cases, we might get a 0x02
* as a result of us emitting the init request
*/
break;
case 0xff: /* Link event */
/* Not handled for now */
break;
case 0x80: /* Payloads */
switch (crq.s.format) {
case VIOSRP_SRP_FORMAT: /* AKA VSCSI request */
case VIOSRP_MAD_FORMAT: /* AKA VSCSI response */
vscsi_got_payload(s, &crq);
break;
case VIOSRP_OS400_FORMAT:
case VIOSRP_AIX_FORMAT:
case VIOSRP_LINUX_FORMAT:
case VIOSRP_INLINE_FORMAT:
fprintf(stderr, "vscsi_do_srq: Unsupported payload format %02x\n",
crq.s.format);
break;
default:
fprintf(stderr, "vscsi_do_srq: Unknown payload format %02x\n",
crq.s.format);
}
break;
default:
fprintf(stderr, "vscsi_do_crq: unknown CRQ %02x %02x ...\n",
crq.raw[0], crq.raw[1]);
};
return 0;
}
static const struct SCSIBusOps vscsi_scsi_ops = {
.complete = vscsi_command_complete,
.cancel = vscsi_request_cancelled
};
static int spapr_vscsi_init(VIOsPAPRDevice *dev)
{
VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev);
int i;
dbg_vscsi_state = s;
/* Initialize qemu request tags */
memset(s->reqs, 0, sizeof(s->reqs));
for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
s->reqs[i].qtag = i;
}
dev->crq.SendFunc = vscsi_do_crq;
scsi_bus_new(&s->bus, &dev->qdev, 1, VSCSI_REQ_LIMIT,
&vscsi_scsi_ops);
if (!dev->qdev.hotplugged) {
scsi_bus_legacy_handle_cmdline(&s->bus);
}
return 0;
}
void spapr_vscsi_create(VIOsPAPRBus *bus, uint32_t reg,
qemu_irq qirq, uint32_t vio_irq_num)
{
DeviceState *dev;
VIOsPAPRDevice *sdev;
dev = qdev_create(&bus->bus, "spapr-vscsi");
qdev_prop_set_uint32(dev, "reg", reg);
qdev_init_nofail(dev);
sdev = (VIOsPAPRDevice *)dev;
sdev->qirq = qirq;
sdev->vio_irq_num = vio_irq_num;
}
static int spapr_vscsi_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
{
int ret;
ret = fdt_setprop_cell(fdt, node_off, "#address-cells", 2);
if (ret < 0) {
return ret;
}
ret = fdt_setprop_cell(fdt, node_off, "#size-cells", 0);
if (ret < 0) {
return ret;
}
return 0;
}
static VIOsPAPRDeviceInfo spapr_vscsi = {
.init = spapr_vscsi_init,
.devnode = spapr_vscsi_devnode,
.dt_name = "v-scsi",
.dt_type = "vscsi",
.dt_compatible = "IBM,v-scsi",
.signal_mask = 0x00000001,
.qdev.name = "spapr-vscsi",
.qdev.size = sizeof(VSCSIState),
.qdev.props = (Property[]) {
DEFINE_PROP_UINT32("reg", VIOsPAPRDevice, reg, 0x2000),
DEFINE_PROP_UINT32("dma-window", VIOsPAPRDevice,
rtce_window_size, 0x10000000),
DEFINE_PROP_END_OF_LIST(),
},
};
static void spapr_vscsi_register(void)
{
spapr_vio_bus_register_withprop(&spapr_vscsi);
}
device_init(spapr_vscsi_register);
